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All Journal Industrika : Jurnal Ilmiah Teknik Industri Eksergi: Jurnal Teknik Energi
Sofiani, Gizella
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisis Tingkat Efisiensi Aktivitas Produksi Menggunakan Metode Data Envelopment Analysis (DEA) Model BCC 2-Stage Produksi Tas Sofiani, Gizella; Nurwidiana, Nurwidiana
Industrika : Jurnal Ilmiah Teknik Industri Vol. 9 No. 2 (2025): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/indstrk.v9i2.2002

Abstract

Efficiency improvements are always carried out on an ongoing basis to be able to meet market needs.  A garment manufacturing company making travel bags has been experiencing problems in meeting production targets. Efficiency measurements need to be carried out with aim of knowing the level of efficiency of the production process, and factors that influence inefficiency, and there is a need for proposed improvements to optimize the efficiency of the production process. The efficiency value is measured using the Data Envelopment Analysis (DEA) method. The efficiency of the production process was measured by 12 DMUs with 4 input variables and 3 output variables. The variables used include the number of workers, working hours, wages, production targets, production results, output hours, and product prices. Analysis of processing efficiency using the BCC model DEA method with the help of the Win4Deap2 program shows that 6 DMUs are declared efficient and 6 other DMUs are inefficient. Inefficient DMUs are DMU 2 97.4%, DMU 3 91.2%, DMU 6 99.8%, DMU 8 96.2%, DMU 9 97.1%, DMU 11 87.3% . There needs to be improvements to the 6 inefficient DMUs by referring to the efficient DMUs. Keywords: Data Envelopment Analysis, Efficiency, Production Process
Performance Characteristics of Savonius Wind Turbines With Variations Air Gaps in Supporting the Development of Renewable Energy Hermawan, Baktiyar Mei; Sumarno, F. Gatot; Prasetyo, Totok; Sahid, Sahid; Roihatin, Anis; Aulia, Nur Fatowil; Surindra, M. Denny; Mulyono, Mulyono; Sofiani, Gizella; Putri, Tania Prameswari; Ariyanto, Wahyu
Eksergi Vol. 19 No. 01 (2023): JANUARY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i01.4252

Abstract

To overcome the occurrence of an energy crisis in the future, an innovation / invention of energy that is environmentally friendly and energy sources will not run out in the future. Energy sources that are environmentally friendly and their potential when developed is very large, one of which is energy sources derived from wind energy. This study aims to determine the effect of wind speed on the performance of wind turbines. To find out the performance characteristics of wind turbines with variations in air gaps. The research method begins with the design / design of the wind turbine, then continues the manufacturing stage, the assembling and installation stage, the testing of tools and analysis, the tests carried out include testing the performance characteristics of the wind turbine. The parameters measured in this study are rotation, torque as well as calculating the kinetic power produced, TSR and CP. The test results conducted showed that the 200 mm air gap Savonius wind turbine with a value of CP = 0.02480-0.15658 had optimum work at low wind speeds (4 m / s). Meanwhile, the 170 mm airborne Savonius wind turbine with a value of CP = 0.00593-0.14668 has optimum work at high wind speeds (8 m / s to 9 m / s). Keywords- wind turbine savonius, air gap, coefficent of power.
Co-Authors Anis Roihatin Ariyanto, Wahyu Aulia, Nur Fatowil F. Gatot Sumarno, F. Gatot Hermawan, Baktiyar Mei Mochammad Denny Surindra Mulyono Mulyono Nurwidiana Nurwidiana Putri, Tania Prameswari Sahid Sahid Totok Prasetyo